Bibliography:

U.S. patent number 5,404,868 “Apparatus Using a Balloon Supported Reflective Surface for Reflecting Light from the Sun”, issued April 11, 1995, inventor Mithra M.K.V. Sankrithi, assignee Vedanta Society of Western Washington.

SAND89-7028, “Design and Demonstration of an Improved Stretched-Membrane Heliostat”, Solar Kinetics, December 1989

SAND89-7040, “Selection and Design of a Stretched-Membrane Heliostat for Today’s Markets”, Science Applications International Corportation (SAIC), January 1990